Cutting tool

Abstract

A tool includes a cutting insert with a shank, which extends along a cutting insert longitudinal axis, and with at least one cutting edge, wherein at least a part of the cutting insert is a first material and further includes a tool holder which extends along a holder longitudinal axis and includes on an end-face end a cutting insert receptacle for receiving the cutting insert shank, wherein the cutting insert receptacle is a cup-shaped recess. The tool further includes an attachment element which is connected to the cutting insert and extends in a circumferential direction around the cutting insert shank, wherein at least a part of the attachment element is a second, different material. The tool also includes a fastening element for fastening the cutting insert on the tool holder, wherein, in a mounted state, the fastening element contacts the attachment element to fasten the cutting insert on the tool holder.

What is claimed is: 
     
       1. A tool for machining a workpiece, comprising:
 a cutting insert with a shank, which extends along a cutting insert longitudinal axis, and with at least one cutting edge, wherein at least a part of the cutting insert is made of a first material; 
 a tool holder which extends along a holder longitudinal axis and comprises on an end-face end a cutting insert receptacle which is configured to receive the cut-ting insert shank, wherein the cutting insert receptacle is designed as a cup-shaped recess in the tool holder; 
 an attachment element which extends in a circumferential direction around the cutting insert shank, wherein at least a part of the attachment element is made of a second material which differs from the first material, and wherein the attachment element is shrunk onto the cutting insert shank or is soldered or weld-ed to said cutting insert shank; and 
 a fastening element which is configured to fasten the cutting insert on the tool holder, wherein the fastening element contacts the attachment element in order to fasten the cutting insert on the tool holder, 
 wherein the cutting insert receptacle has a front region which is configured to receive the attachment element, and a rear region which is configured to receive the cutting insert shank, wherein a first distance from the rear region to the end-face end is larger than a second distance from the front region to the end-face end, and wherein the front region, when measured orthogonally with respect to the holder longitudinal axis, has a larger diameter than the rear region. 
 
     
     
       2. The tool as claimed in  claim 1 , wherein each of the cutting insert shank and the cutting insert receptacle have a circular cross section, and the attachment element has a cross section at least a portion of which is circular ring-shaped. 
     
     
       3. The tool as claimed in  claim 1 , wherein the first material is hard metal and the second material is steel. 
     
     
       4. The tool as claimed in  claim 1 , wherein an axial contact surface, against which the attachment element abuts, is arranged in the cutting insert receptacle between the front region and the rear region, wherein the axial contact surface is aligned orthogonally with respect to the holder longitudinal axis. 
     
     
       5. The tool as claimed in  claim 4 , wherein the attachment element comprises an outside circumferential surface which is remote from the cutting insert longitudinal axis and abuts against an inside surface of the cutting insert receptacle, which inside surface is arranged in the front region of the cutting insert receptacle, wherein each of the outside circumferential surface of the attachment element and the inside sur-face of the cutting insert receptacle are at least partially conical or cylindrical. 
     
     
       6. The tool as claimed in  claim 1 , wherein the attachment element comprises a blind hole or recess which extends in a radial direction. 
     
     
       7. The tool as claimed in  claim 6 , wherein the attachment element comprises a groove, which is arranged on a side opposite the blind hole or recess, and extends parallel to the cutting insert longitudinal axis. 
     
     
       8. The tool as claimed in  claim 7 , wherein the tool comprises an adjusting element which engages in the groove for adjusting the cutting insert with respect to the tool holder. 
     
     
       9. The tool as claimed in  claim 8 , wherein the groove has a V-shaped cross section and the adjusting element comprises a clamping screw with a conical tip. 
     
     
       10. The tool as claimed in  claim 1 , wherein the fastening element comprises a clamping screw with a conical tip. 
     
     
       11. The tool as claimed in  claim 1 , wherein the attachment element comprises a blind hole or recess which extends in a radial direction, wherein the attachment element comprises a groove having has a V-shaped cross section, wherein the groove is arranged on a side opposite the blind hole or recess and extends parallel to the cutting insert longitudinal axis, wherein the tool comprises an adjusting element which engages in the groove, wherein the fastening element comprises a first clamping screw with a conical tip, and wherein the adjusting element comprises a second clamping screw with a conical tip, wherein the tool holder comprises a first holder bore with a first thread which corresponds with the first clamping screw, and wherein the tool holder comprises a second holder bore with a second thread which corresponds with the second clamping screw, and wherein each of the first and the second holder bores extends orthogonally with respect to the holder longitudinal axis in a radial direction and is realized as a through-bore. 
     
     
       12. The tool as claimed in  claim 11 , wherein the first holder bore comprises a first center axis and the second holder bore comprises a second center axis, wherein the first and the second center axes extend parallel to one another and are offset with respect to one another along the holder longitudinal axis. 
     
     
       13. The tool as claimed in  claim 1 , wherein the attachment element comprises at least one coolant bore which is realized as a through hole. 
     
     
       14. A tool for machining a workpiece, comprising:
 a cutting insert with a shank, which extends along a cutting insert longitudinal axis, and with at least one cutting edge, wherein at least a part of the cutting insert is made of a first material; 
 a tool holder which is fixedly connected to the cutting insert and extends along a holder longitudinal axis and comprises on an end-face end a cutting insert receptacle which is configured to receive the cutting insert shank, wherein the cut-ting insert receptacle is designed as a cup-shaped recess in the tool holder; 
 an attachment element which extends in a circumferential direction around the cutting insert shank, wherein at least a part of the attachment element is made of a second material which differs from the first material, and wherein the attachment element comprises at least one coolant bore which is realized as a through hole; and 
 a fastening element which is configured to fasten the cutting insert on the tool holder, wherein the fastening element contacts the attachment element in order to fasten the cutting insert on the tool holder; 
 wherein the cutting insert receptacle has a front region which is configured to receive the attachment element, and a rear region which is configured to receive the cutting insert shank, wherein a first distance from the rear region to the end-face end is larger than a second distance from the front region to the end-face end, and wherein the front region, when measured orthogonally with respect to the holder longitudinal axis, has a larger diameter than the rear region. 
 
     
     
       15. The tool as claimed in  claim 14 , wherein each of the cutting insert shank and the cutting insert receptacle have a circular cross section and the attachment element has a cross section at least a portion of which is circular ring-shaped. 
     
     
       16. The tool as claimed in  claim 14 , wherein the first material is hard metal and the second material is steel. 
     
     
       17. The tool as claimed in  claim 14 , wherein an axial contact surface, against which the attachment element abuts, is arranged in the cutting insert receptacle between the front region and the rear region, wherein the axial contact surface is aligned orthogonally with respect to the holder longitudinal axis. 
     
     
       18. The tool as claimed in  claim 14 , wherein the attachment element comprises a blind hole or recess which extends in a radial direction.